LLCC68 datasheet(77/111 Pages) SEMTECH

77 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

77 of 111

Semtech

LLCC68

www.semtech.com

13.2 Registers and Buffer Access

13.2.1 WriteRegister Function

The command WriteRegister(...) writes a block of bytes in a data memory space starting at a specific address. The address is auto

incremented after each data byte so that data is stored in contiguous memory locations. The SPI data transfer is described in the following

table.

13.2.2 ReadRegister Function

The command ReadRegister(...) reads a block of data starting at a given address. The address is auto-incremented after each byte.

The SPI data transfer is described in Table 13-25.

Note: The host must send an NOP after sending the 2 bytes of address to start receiving data bytes on the next NOP sent.

13.2.3 WriteBuffer Function

This function stores data payload to be transmitted. The address is auto-incremented; when it exceeds the value of 255 it is wrapped back

to 0 due to the circular nature of the data buffer. The address starts with an offset set as a parameter of the function. Table 13-26 describes

the SPI data transfer.

Table 13-24: WriteRegister SPI Transaction

Byte

...

Data from

host

Opcode =

0x0D

address[15:8]

address[7:0]

data@address

data@address+1

...

data@address+ (n-3)

Data to host

RFU

Status

...

Status

Table 13-25: ReadRegister SPI Transaction

Byte

...

Data from

host

Opcode

= 0x1D

address[15:8]

address[7:0]

NOP

...

NOP

Data to host

RFU

Status

data@addres

data@address+1

...

data@address+(n-4)

Table 13-26: WriteBuffer SPI Transaction

Byte

...

Data from host

Opcode =

0x0E

offset

data@offset

data@offset+1

...

data@offset+(n-2)

Data to host

RFU

Status

...

Status

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